playlists now save to files, can be restored from files

frontend/wailsjs/go/library/Library.d.ts

@@ -15,4 +15,6 @@ export function Scan():Promise<library.ScanMetrics>;
 
 export function SetContext(arg1:context.Context):Promise<void>;
 
+export function SetPlaylistRestorer(arg1:library.playlistRestorer):Promise<void>;
+
 export function SetQueue(arg1:library.queueClearer):Promise<void>;

frontend/wailsjs/go/library/Library.js

@@ -26,6 +26,10 @@ export function SetContext(arg1) {
   return window['go']['library']['Library']['SetContext'](arg1);
 }
 
+export function SetPlaylistRestorer(arg1) {
+  return window['go']['library']['Library']['SetPlaylistRestorer'](arg1);
+}
+
 export function SetQueue(arg1) {
   return window['go']['library']['Library']['SetQueue'](arg1);
 }